updated test suite for testing the api.
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out_idx is an [out] parameter.
Correct me if I am wrong, but I would say:
This function searches for the data pointer @p data inside @p array, returning @c EINA_TRUE if found. The exact position where the pointer is found can be retrieved through @p out_idx. Please note that only the pointer is compared, not the actual data pointed by it. @since 1.23